Early land arthropods sported shells

Early land arthropods sported shells

Gear may have made the land-to-water transition possible

By Sid Perkins, 17:03 PM April 10, 2009

Some of the first creatures to leave the ocean and venture onto land may have done so by carrying a bit of the sea with them: Fossil trackways left on ancient tidal flats 500 million years ago hint that some ocean-dwelling arthropods, like today’s hermit crabs, hauled out onto land wearing shells. Those shells would have protected the creatures’ delicate gills from drying out and may also have held small reservoirs of seawater.

Much scientific attention has focused on the water-to-land tran...

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